Actually the 737NGs have significantly more range than the Airbus. Ranges according to the company websites:No, you don't, but it is comparing apples to oranges. The 73G is comparable to an A319, not an A320. The A319 would have zero problem doing these routes. Whereareas when Alaska Airlines uses 739s on trans-cons, they were notorious for making fuel stops, especially on MIA-SEA.
The A320 is comparable to a 738, and if a one-class 738 probably would have the same issues going trans-con.
319 1800nm (tho' most US operators have extra tanks)
320 2650nm
321 2300nm
737-700 3365nm
737-800 3060nm
737-900 2700nm
The difference is largely related to time of design. The Airbus was done first, when small plane transcons were not common. After the Airbus proved the market for longer, thinner routes, Boeing designed the NG with sufficient range to serve that market.